Improvement in rulers



G. GOUSINS.

Ruler;

Patented Dec.17,18?8.

1. ill

INVENTOR WITNESS 7/ M' o/a ATTORfiEYS.

N-PETERS, PBOTD-UTNOGRAPHER, WASQIINGYOI. P C- UNITED Srnrns Pare p FIGE.

GEORGE COUSINS, OF OSWEGO, NElV YORK.

IMPROVEMENT IN RULERS.

Specification forming part of Letters Patent- No. 210,922, dated December 17, 1878; application filed November 16, 1878. v

To all whom it may concern:

Be it known that I, GEORGE OoUsINs, of Oswego, in the county of Oswego and State of New York, have invented a new and useful Improvement in Parallel Rulers, of which the following is a specification:

Figure l is a side view of my improved ruler. Fig. 2 is a'detail section of the same, taken through the broken line a; as, Fig. 3. Fig. 3 is a top view of the same.

Similar letters of reference indicate corresponding parts.

The object of this invention is to furnish an improved ruler for ruling parallel lines, for sectionlining, and for various other purposes, which shall be simple in construction and convenient and accurate in use.

The invention consists in an improved parallel ruler formed by the combination of the bearing-blocks, the shaft, the rollers provided with the adjustable stop and the stationary stop, the adjustable slotted plate and its clam ping screw and nut, and the spiral spring with the plate provided with the segmentholes, as hereinafter fully described.

A represents the body or plate of the ruler, the forward edge of which is beveled, and provided with a scale of division-marks. The rear edge of the plate A is straight. To the rear part of the plate A, at a little distance from its ends, are attached two bearing-blocks, B, the rear ends of which project beyond the rear edge of the said plate A, and in them re- I volves the shaft 0. The middle part of the shaft 0 is milled, to enable it to be turned more easily and with more certainty.

To the shaft 0 are attached two rollers, D, the faces of which have deep ring-grooves formed in them.

The rear end of the bearing-blocks B should have so much rise that the faces of the rollers D may be clear of the paper when the plate A rests squarely upon it.

The outer side of one of the rollers D has a scale of divisioninarks formed upon it, as shown in Fig. 1, and to it is adjustably attached a stop, E, by a clamping-screw, F, which passes through its inner en d, and screws into the end of the shaft (3, so as to clamp the lines. bears down upon the shaft 0 enough to bring the rollers D in contact with the paper, and

said stop against the side of the said roller D. The side edge of the stop-block E is beveled off, to enable it to be more readily set to the marks of the scale. To the face of the roller D, in the bottom of its groove, is attached a stop-pin, G, the outer end of which is a trifle below the face of the roller D.

Upon the upper side of the plate A, directly in front of the roller D, is placed a plate, H, the rear end of which is slotted to fit upon the grooved face of the roller 1), so that it may be struck by the stops G when the roller D is revolved. The plate His slotted longitudinally to receive a screw, I, attached to the plate A, and secured in place by a hand-nut, J, screwed upon the said screw I.

To the bearing-block B is attached one end of the spiral spring K, which is coiled around the shaft 0, and its other end is attached to the said shaft.

In the plate A are formed a number of circular holes, a, of various sizes, and which are made with beveled edges for convenience in drawing small circles. 1n the plate A are also formed two holes, o in the form of segments of circles, and which are so arranged that the straight sides or chords of the said holes may be at an angle of forty-five degrees (45 with the edge of the plate A, so that they may be used for drawing sectional lines.

In using the instrument for drawing parallel lines at uniform distances apart, the stop E is adjusted at such a distance from the stop G that the rollers D, in revolving through the said distance, may carry the plate A for a distance equal to the space to be left between the When the ruler is to be moved the user then draws it toward him until the stop E strikes against the plate H. The user then gently removes the pressure from the shaft 0, and allows the plate A to drop back upon the paper, care being taken not to allow it to slip. As the pressure is removed from the shaft 0, the spiral spring K turns the rollers D back until the stop G strikes the plate H, and the said rollers D are then ready to carry the plate A through another space. The slot in the plate H allows the said plate to be used in stop E and the stationary stop G, the adjustconnection with the rollers D, or not as may able slotted plate H- and its clamping-screw be desired. and nut I J and the spiral spring K, with the Having thus described my invention, I plate A, provided With the segment-holes a claim as new and desire to secure by Letters substantially as herein shown and described.

Patent- GEORGE OOUSIN S.

An improved parallel ruler formed by the Witnesses: combination of the bearing-blocks B, the shaft HENRY GALLAGHER,

O, the rollers D, provided with the adjustable 1 FRED. PAPPA. 

